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Diffstat (limited to 'doc/manual/advanced-topics')
| -rw-r--r-- | doc/manual/advanced-topics/advanced-topics.xml | 14 | ||||
| -rw-r--r-- | doc/manual/advanced-topics/cores-vs-jobs.xml | 121 | ||||
| -rw-r--r-- | doc/manual/advanced-topics/diff-hook.xml | 205 | ||||
| -rw-r--r-- | doc/manual/advanced-topics/distributed-builds.xml | 190 | ||||
| -rw-r--r-- | doc/manual/advanced-topics/post-build-hook.xml | 160 |
5 files changed, 0 insertions, 690 deletions
diff --git a/doc/manual/advanced-topics/advanced-topics.xml b/doc/manual/advanced-topics/advanced-topics.xml deleted file mode 100644 index 871b7eb1d..000000000 --- a/doc/manual/advanced-topics/advanced-topics.xml +++ /dev/null @@ -1,14 +0,0 @@ -<part xmlns="http://docbook.org/ns/docbook" - xmlns:xlink="http://www.w3.org/1999/xlink" - xmlns:xi="http://www.w3.org/2001/XInclude" - xml:id="part-advanced-topics" - version="5.0"> - -<title>Advanced Topics</title> - -<xi:include href="distributed-builds.xml" /> -<xi:include href="cores-vs-jobs.xml" /> -<xi:include href="diff-hook.xml" /> -<xi:include href="post-build-hook.xml" /> - -</part> diff --git a/doc/manual/advanced-topics/cores-vs-jobs.xml b/doc/manual/advanced-topics/cores-vs-jobs.xml deleted file mode 100644 index 4d58ac7c5..000000000 --- a/doc/manual/advanced-topics/cores-vs-jobs.xml +++ /dev/null @@ -1,121 +0,0 @@ -<chapter xmlns="http://docbook.org/ns/docbook" - xmlns:xlink="http://www.w3.org/1999/xlink" - xmlns:xi="http://www.w3.org/2001/XInclude" - version="5.0" - xml:id="chap-tuning-cores-and-jobs"> - -<title>Tuning Cores and Jobs</title> - -<para>Nix has two relevant settings with regards to how your CPU cores -will be utilized: <xref linkend="conf-cores" /> and -<xref linkend="conf-max-jobs" />. This chapter will talk about what -they are, how they interact, and their configuration trade-offs.</para> - -<variablelist> - <varlistentry> - <term><xref linkend="conf-max-jobs" /></term> - <listitem><para> - Dictates how many separate derivations will be built at the same - time. If you set this to zero, the local machine will do no - builds. Nix will still substitute from binary caches, and build - remotely if remote builders are configured. - </para></listitem> - </varlistentry> - <varlistentry> - <term><xref linkend="conf-cores" /></term> - <listitem><para> - Suggests how many cores each derivation should use. Similar to - <command>make -j</command>. - </para></listitem> - </varlistentry> -</variablelist> - -<para>The <xref linkend="conf-cores" /> setting determines the value of -<envar>NIX_BUILD_CORES</envar>. <envar>NIX_BUILD_CORES</envar> is equal -to <xref linkend="conf-cores" />, unless <xref linkend="conf-cores" /> -equals <literal>0</literal>, in which case <envar>NIX_BUILD_CORES</envar> -will be the total number of cores in the system.</para> - -<para>The maximum number of consumed cores is a simple multiplication, -<xref linkend="conf-max-jobs" /> * <envar>NIX_BUILD_CORES</envar>.</para> - -<para>The balance on how to set these two independent variables depends -upon each builder's workload and hardware. Here are a few example -scenarios on a machine with 24 cores:</para> - -<table> - <caption>Balancing 24 Build Cores</caption> - <thead> - <tr> - <th><xref linkend="conf-max-jobs" /></th> - <th><xref linkend="conf-cores" /></th> - <th><envar>NIX_BUILD_CORES</envar></th> - <th>Maximum Processes</th> - <th>Result</th> - </tr> - </thead> - <tbody> - <tr> - <td>1</td> - <td>24</td> - <td>24</td> - <td>24</td> - <td> - One derivation will be built at a time, each one can use 24 - cores. Undersold if a job can’t use 24 cores. - </td> - </tr> - - <tr> - <td>4</td> - <td>6</td> - <td>6</td> - <td>24</td> - <td> - Four derivations will be built at once, each given access to - six cores. - </td> - </tr> - <tr> - <td>12</td> - <td>6</td> - <td>6</td> - <td>72</td> - <td> - 12 derivations will be built at once, each given access to six - cores. This configuration is over-sold. If all 12 derivations - being built simultaneously try to use all six cores, the - machine's performance will be degraded due to extensive context - switching between the 12 builds. - </td> - </tr> - <tr> - <td>24</td> - <td>1</td> - <td>1</td> - <td>24</td> - <td> - 24 derivations can build at the same time, each using a single - core. Never oversold, but derivations which require many cores - will be very slow to compile. - </td> - </tr> - <tr> - <td>24</td> - <td>0</td> - <td>24</td> - <td>576</td> - <td> - 24 derivations can build at the same time, each using all the - available cores of the machine. Very likely to be oversold, - and very likely to suffer context switches. - </td> - </tr> - </tbody> -</table> - -<para>It is up to the derivations' build script to respect -host's requested cores-per-build by following the value of the -<envar>NIX_BUILD_CORES</envar> environment variable.</para> - -</chapter> diff --git a/doc/manual/advanced-topics/diff-hook.xml b/doc/manual/advanced-topics/diff-hook.xml deleted file mode 100644 index f01ab71b3..000000000 --- a/doc/manual/advanced-topics/diff-hook.xml +++ /dev/null @@ -1,205 +0,0 @@ -<chapter xmlns="http://docbook.org/ns/docbook" - xmlns:xlink="http://www.w3.org/1999/xlink" - xmlns:xi="http://www.w3.org/2001/XInclude" - xml:id="chap-diff-hook" - version="5.0" - > - -<title>Verifying Build Reproducibility with <option linkend="conf-diff-hook">diff-hook</option></title> - -<subtitle>Check build reproducibility by running builds multiple times -and comparing their results.</subtitle> - -<para>Specify a program with Nix's <xref linkend="conf-diff-hook" /> to -compare build results when two builds produce different results. Note: -this hook is only executed if the results are not the same, this hook -is not used for determining if the results are the same.</para> - -<para>For purposes of demonstration, we'll use the following Nix file, -<filename>deterministic.nix</filename> for testing:</para> - -<programlisting> -let - inherit (import <nixpkgs> {}) runCommand; -in { - stable = runCommand "stable" {} '' - touch $out - ''; - - unstable = runCommand "unstable" {} '' - echo $RANDOM > $out - ''; -} -</programlisting> - -<para>Additionally, <filename>nix.conf</filename> contains: - -<programlisting> -diff-hook = /etc/nix/my-diff-hook -run-diff-hook = true -</programlisting> - -where <filename>/etc/nix/my-diff-hook</filename> is an executable -file containing: - -<programlisting> -#!/bin/sh -exec >&2 -echo "For derivation $3:" -/run/current-system/sw/bin/diff -r "$1" "$2" -</programlisting> - -</para> - -<para>The diff hook is executed by the same user and group who ran the -build. However, the diff hook does not have write access to the store -path just built.</para> - -<section> - <title> - Spot-Checking Build Determinism - </title> - - <para> - Verify a path which already exists in the Nix store by passing - <option>--check</option> to the build command. - </para> - - <para>If the build passes and is deterministic, Nix will exit with a - status code of 0:</para> - - <screen> -$ nix-build ./deterministic.nix -A stable -this derivation will be built: - /nix/store/z98fasz2jqy9gs0xbvdj939p27jwda38-stable.drv -building '/nix/store/z98fasz2jqy9gs0xbvdj939p27jwda38-stable.drv'... -/nix/store/yyxlzw3vqaas7wfp04g0b1xg51f2czgq-stable - -$ nix-build ./deterministic.nix -A stable --check -checking outputs of '/nix/store/z98fasz2jqy9gs0xbvdj939p27jwda38-stable.drv'... -/nix/store/yyxlzw3vqaas7wfp04g0b1xg51f2czgq-stable -</screen> - - <para>If the build is not deterministic, Nix will exit with a status - code of 1:</para> - - <screen> -$ nix-build ./deterministic.nix -A unstable -this derivation will be built: - /nix/store/cgl13lbj1w368r5z8gywipl1ifli7dhk-unstable.drv -building '/nix/store/cgl13lbj1w368r5z8gywipl1ifli7dhk-unstable.drv'... -/nix/store/krpqk0l9ib0ibi1d2w52z293zw455cap-unstable - -$ nix-build ./deterministic.nix -A unstable --check -checking outputs of '/nix/store/cgl13lbj1w368r5z8gywipl1ifli7dhk-unstable.drv'... -error: derivation '/nix/store/cgl13lbj1w368r5z8gywipl1ifli7dhk-unstable.drv' may not be deterministic: output '/nix/store/krpqk0l9ib0ibi1d2w52z293zw455cap-unstable' differs -</screen> - -<para>In the Nix daemon's log, we will now see: -<screen> -For derivation /nix/store/cgl13lbj1w368r5z8gywipl1ifli7dhk-unstable.drv: -1c1 -< 8108 ---- -> 30204 -</screen> -</para> - - <para>Using <option>--check</option> with <option>--keep-failed</option> - will cause Nix to keep the second build's output in a special, - <literal>.check</literal> path:</para> - - <screen> -$ nix-build ./deterministic.nix -A unstable --check --keep-failed -checking outputs of '/nix/store/cgl13lbj1w368r5z8gywipl1ifli7dhk-unstable.drv'... -note: keeping build directory '/tmp/nix-build-unstable.drv-0' -error: derivation '/nix/store/cgl13lbj1w368r5z8gywipl1ifli7dhk-unstable.drv' may not be deterministic: output '/nix/store/krpqk0l9ib0ibi1d2w52z293zw455cap-unstable' differs from '/nix/store/krpqk0l9ib0ibi1d2w52z293zw455cap-unstable.check' -</screen> - - <para>In particular, notice the - <literal>/nix/store/krpqk0l9ib0ibi1d2w52z293zw455cap-unstable.check</literal> - output. Nix has copied the build results to that directory where you - can examine it.</para> - - <note xml:id="check-dirs-are-unregistered"> - <title><literal>.check</literal> paths are not registered store paths</title> - - <para>Check paths are not protected against garbage collection, - and this path will be deleted on the next garbage collection.</para> - - <para>The path is guaranteed to be alive for the duration of - <xref linkend="conf-diff-hook" />'s execution, but may be deleted - any time after.</para> - - <para>If the comparison is performed as part of automated tooling, - please use the diff-hook or author your tooling to handle the case - where the build was not deterministic and also a check path does - not exist.</para> - </note> - - <para> - <option>--check</option> is only usable if the derivation has - been built on the system already. If the derivation has not been - built Nix will fail with the error: - <screen> -error: some outputs of '/nix/store/hzi1h60z2qf0nb85iwnpvrai3j2w7rr6-unstable.drv' are not valid, so checking is not possible -</screen> - - Run the build without <option>--check</option>, and then try with - <option>--check</option> again. - </para> -</section> - -<section> - <title> - Automatic and Optionally Enforced Determinism Verification - </title> - - <para> - Automatically verify every build at build time by executing the - build multiple times. - </para> - - <para> - Setting <xref linkend="conf-repeat" /> and - <xref linkend="conf-enforce-determinism" /> in your - <filename>nix.conf</filename> permits the automated verification - of every build Nix performs. - </para> - - <para> - The following configuration will run each build three times, and - will require the build to be deterministic: - - <programlisting> -enforce-determinism = true -repeat = 2 -</programlisting> - </para> - - <para> - Setting <xref linkend="conf-enforce-determinism" /> to false as in - the following configuration will run the build multiple times, - execute the build hook, but will allow the build to succeed even - if it does not build reproducibly: - - <programlisting> -enforce-determinism = false -repeat = 1 -</programlisting> - </para> - - <para> - An example output of this configuration: - <screen> -$ nix-build ./test.nix -A unstable -this derivation will be built: - /nix/store/ch6llwpr2h8c3jmnf3f2ghkhx59aa97f-unstable.drv -building '/nix/store/ch6llwpr2h8c3jmnf3f2ghkhx59aa97f-unstable.drv' (round 1/2)... -building '/nix/store/ch6llwpr2h8c3jmnf3f2ghkhx59aa97f-unstable.drv' (round 2/2)... -output '/nix/store/6xg356v9gl03hpbbg8gws77n19qanh02-unstable' of '/nix/store/ch6llwpr2h8c3jmnf3f2ghkhx59aa97f-unstable.drv' differs from '/nix/store/6xg356v9gl03hpbbg8gws77n19qanh02-unstable.check' from previous round -/nix/store/6xg356v9gl03hpbbg8gws77n19qanh02-unstable -</screen> - </para> -</section> -</chapter> diff --git a/doc/manual/advanced-topics/distributed-builds.xml b/doc/manual/advanced-topics/distributed-builds.xml deleted file mode 100644 index 9ac4a92cd..000000000 --- a/doc/manual/advanced-topics/distributed-builds.xml +++ /dev/null @@ -1,190 +0,0 @@ -<chapter xmlns="http://docbook.org/ns/docbook" - xmlns:xlink="http://www.w3.org/1999/xlink" - xmlns:xi="http://www.w3.org/2001/XInclude" - version="5.0" - xml:id='chap-distributed-builds'> - -<title>Remote Builds</title> - -<para>Nix supports remote builds, where a local Nix installation can -forward Nix builds to other machines. This allows multiple builds to -be performed in parallel and allows Nix to perform multi-platform -builds in a semi-transparent way. For instance, if you perform a -build for a <literal>x86_64-darwin</literal> on an -<literal>i686-linux</literal> machine, Nix can automatically forward -the build to a <literal>x86_64-darwin</literal> machine, if -available.</para> - -<para>To forward a build to a remote machine, it’s required that the -remote machine is accessible via SSH and that it has Nix -installed. You can test whether connecting to the remote Nix instance -works, e.g. - -<screen> -$ nix ping-store --store ssh://mac -</screen> - -will try to connect to the machine named <literal>mac</literal>. It is -possible to specify an SSH identity file as part of the remote store -URI, e.g. - -<screen> -$ nix ping-store --store ssh://mac?ssh-key=/home/alice/my-key -</screen> - -Since builds should be non-interactive, the key should not have a -passphrase. Alternatively, you can load identities ahead of time into -<command>ssh-agent</command> or <command>gpg-agent</command>.</para> - -<para>If you get the error - -<screen> -bash: nix-store: command not found -error: cannot connect to 'mac' -</screen> - -then you need to ensure that the <envar>PATH</envar> of -non-interactive login shells contains Nix.</para> - -<warning><para>If you are building via the Nix daemon, it is the Nix -daemon user account (that is, <literal>root</literal>) that should -have SSH access to the remote machine. If you can’t or don’t want to -configure <literal>root</literal> to be able to access to remote -machine, you can use a private Nix store instead by passing -e.g. <literal>--store ~/my-nix</literal>.</para></warning> - -<para>The list of remote machines can be specified on the command line -or in the Nix configuration file. The former is convenient for -testing. For example, the following command allows you to build a -derivation for <literal>x86_64-darwin</literal> on a Linux machine: - -<screen> -$ uname -Linux - -$ nix build \ - '(with import <nixpkgs> { system = "x86_64-darwin"; }; runCommand "foo" {} "uname > $out")' \ - --builders 'ssh://mac x86_64-darwin' -[1/0/1 built, 0.0 MiB DL] building foo on ssh://mac - -$ cat ./result -Darwin -</screen> - -It is possible to specify multiple builders separated by a semicolon -or a newline, e.g. - -<screen> - --builders 'ssh://mac x86_64-darwin ; ssh://beastie x86_64-freebsd' -</screen> -</para> - -<para>Each machine specification consists of the following elements, -separated by spaces. Only the first element is required. -To leave a field at its default, set it to <literal>-</literal>. - -<orderedlist> - - <listitem><para>The URI of the remote store in the format - <literal>ssh://[<replaceable>username</replaceable>@]<replaceable>hostname</replaceable></literal>, - e.g. <literal>ssh://nix@mac</literal> or - <literal>ssh://mac</literal>. For backward compatibility, - <literal>ssh://</literal> may be omitted. The hostname may be an - alias defined in your - <filename>~/.ssh/config</filename>.</para></listitem> - - <listitem><para>A comma-separated list of Nix platform type - identifiers, such as <literal>x86_64-darwin</literal>. It is - possible for a machine to support multiple platform types, e.g., - <literal>i686-linux,x86_64-linux</literal>. If omitted, this - defaults to the local platform type.</para></listitem> - - <listitem><para>The SSH identity file to be used to log in to the - remote machine. If omitted, SSH will use its regular - identities.</para></listitem> - - <listitem><para>The maximum number of builds that Nix will execute - in parallel on the machine. Typically this should be equal to the - number of CPU cores. For instance, the machine - <literal>itchy</literal> in the example will execute up to 8 builds - in parallel.</para></listitem> - - <listitem><para>The “speed factor”, indicating the relative speed of - the machine. If there are multiple machines of the right type, Nix - will prefer the fastest, taking load into account.</para></listitem> - - <listitem><para>A comma-separated list of <emphasis>supported - features</emphasis>. If a derivation has the - <varname>requiredSystemFeatures</varname> attribute, then Nix will - only perform the derivation on a machine that has the specified - features. For instance, the attribute - -<programlisting> -requiredSystemFeatures = [ "kvm" ]; -</programlisting> - - will cause the build to be performed on a machine that has the - <literal>kvm</literal> feature.</para></listitem> - - <listitem><para>A comma-separated list of <emphasis>mandatory - features</emphasis>. A machine will only be used to build a - derivation if all of the machine’s mandatory features appear in the - derivation’s <varname>requiredSystemFeatures</varname> - attribute..</para></listitem> - -</orderedlist> - -For example, the machine specification - -<programlisting> -nix@scratchy.labs.cs.uu.nl i686-linux /home/nix/.ssh/id_scratchy_auto 8 1 kvm -nix@itchy.labs.cs.uu.nl i686-linux /home/nix/.ssh/id_scratchy_auto 8 2 -nix@poochie.labs.cs.uu.nl i686-linux /home/nix/.ssh/id_scratchy_auto 1 2 kvm benchmark -</programlisting> - -specifies several machines that can perform -<literal>i686-linux</literal> builds. However, -<literal>poochie</literal> will only do builds that have the attribute - -<programlisting> -requiredSystemFeatures = [ "benchmark" ]; -</programlisting> - -or - -<programlisting> -requiredSystemFeatures = [ "benchmark" "kvm" ]; -</programlisting> - -<literal>itchy</literal> cannot do builds that require -<literal>kvm</literal>, but <literal>scratchy</literal> does support -such builds. For regular builds, <literal>itchy</literal> will be -preferred over <literal>scratchy</literal> because it has a higher -speed factor.</para> - -<para>Remote builders can also be configured in -<filename>nix.conf</filename>, e.g. - -<programlisting> -builders = ssh://mac x86_64-darwin ; ssh://beastie x86_64-freebsd -</programlisting> - -Finally, remote builders can be configured in a separate configuration -file included in <option>builders</option> via the syntax -<literal>@<replaceable>file</replaceable></literal>. For example, - -<programlisting> -builders = @/etc/nix/machines -</programlisting> - -causes the list of machines in <filename>/etc/nix/machines</filename> -to be included. (This is the default.)</para> - -<para>If you want the builders to use caches, you likely want to set -the option <link linkend='conf-builders-use-substitutes'><literal>builders-use-substitutes</literal></link> -in your local <filename>nix.conf</filename>.</para> - -<para>To build only on remote builders and disable building on the local machine, -you can use the option <option>--max-jobs 0</option>.</para> - -</chapter> diff --git a/doc/manual/advanced-topics/post-build-hook.xml b/doc/manual/advanced-topics/post-build-hook.xml deleted file mode 100644 index 6cc286ee1..000000000 --- a/doc/manual/advanced-topics/post-build-hook.xml +++ /dev/null @@ -1,160 +0,0 @@ -<chapter xmlns="http://docbook.org/ns/docbook" - xmlns:xlink="http://www.w3.org/1999/xlink" - xmlns:xi="http://www.w3.org/2001/XInclude" - xml:id="chap-post-build-hook" - version="5.0" - > - -<title>Using the <option linkend="conf-post-build-hook">post-build-hook</option></title> -<subtitle>Uploading to an S3-compatible binary cache after each build</subtitle> - - -<section xml:id="chap-post-build-hook-caveats"> - <title>Implementation Caveats</title> - <para>Here we use the post-build hook to upload to a binary cache. - This is a simple and working example, but it is not suitable for all - use cases.</para> - - <para>The post build hook program runs after each executed build, - and blocks the build loop. The build loop exits if the hook program - fails.</para> - - <para>Concretely, this implementation will make Nix slow or unusable - when the internet is slow or unreliable.</para> - - <para>A more advanced implementation might pass the store paths to a - user-supplied daemon or queue for processing the store paths outside - of the build loop.</para> -</section> - -<section> - <title>Prerequisites</title> - - <para> - This tutorial assumes you have configured an S3-compatible binary cache - according to the instructions at - <xref linkend="ssec-s3-substituter-authenticated-writes" />, and - that the <literal>root</literal> user's default AWS profile can - upload to the bucket. - </para> -</section> - -<section> - <title>Set up a Signing Key</title> - <para>Use <command>nix-store --generate-binary-cache-key</command> to - create our public and private signing keys. We will sign paths - with the private key, and distribute the public key for verifying - the authenticity of the paths.</para> - - <screen> -# nix-store --generate-binary-cache-key example-nix-cache-1 /etc/nix/key.private /etc/nix/key.public -# cat /etc/nix/key.public -example-nix-cache-1:1/cKDz3QCCOmwcztD2eV6Coggp6rqc9DGjWv7C0G+rM= -</screen> - -<para>Then, add the public key and the cache URL to your -<filename>nix.conf</filename>'s <xref linkend="conf-trusted-public-keys" /> -and <xref linkend="conf-substituters" /> like:</para> - -<programlisting> -substituters = https://cache.nixos.org/ s3://example-nix-cache -trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= example-nix-cache-1:1/cKDz3QCCOmwcztD2eV6Coggp6rqc9DGjWv7C0G+rM= -</programlisting> - -<para>We will restart the Nix daemon in a later step.</para> -</section> - -<section> - <title>Implementing the build hook</title> - <para>Write the following script to - <filename>/etc/nix/upload-to-cache.sh</filename>: - </para> - - <programlisting> -#!/bin/sh - -set -eu -set -f # disable globbing -export IFS=' ' - -echo "Signing paths" $OUT_PATHS -nix sign-paths --key-file /etc/nix/key.private $OUT_PATHS -echo "Uploading paths" $OUT_PATHS -exec nix copy --to 's3://example-nix-cache' $OUT_PATHS -</programlisting> - - <note> - <title>Should <literal>$OUT_PATHS</literal> be quoted?</title> - <para> - The <literal>$OUT_PATHS</literal> variable is a space-separated - list of Nix store paths. In this case, we expect and want the - shell to perform word splitting to make each output path its - own argument to <command>nix sign-paths</command>. Nix guarantees - the paths will not contain any spaces, however a store path - might contain glob characters. The <command>set -f</command> - disables globbing in the shell. - </para> - </note> - <para> - Then make sure the hook program is executable by the <literal>root</literal> user: - <screen> -# chmod +x /etc/nix/upload-to-cache.sh -</screen></para> -</section> - -<section> - <title>Updating Nix Configuration</title> - - <para>Edit <filename>/etc/nix/nix.conf</filename> to run our hook, - by adding the following configuration snippet at the end:</para> - - <programlisting> -post-build-hook = /etc/nix/upload-to-cache.sh -</programlisting> - -<para>Then, restart the <command>nix-daemon</command>.</para> -</section> - -<section> - <title>Testing</title> - - <para>Build any derivation, for example:</para> - - <screen> -$ nix-build -E '(import <nixpkgs> {}).writeText "example" (builtins.toString builtins.currentTime)' -this derivation will be built: - /nix/store/s4pnfbkalzy5qz57qs6yybna8wylkig6-example.drv -building '/nix/store/s4pnfbkalzy5qz57qs6yybna8wylkig6-example.drv'... -running post-build-hook '/home/grahamc/projects/github.com/NixOS/nix/post-hook.sh'... -post-build-hook: Signing paths /nix/store/ibcyipq5gf91838ldx40mjsp0b8w9n18-example -post-build-hook: Uploading paths /nix/store/ibcyipq5gf91838ldx40mjsp0b8w9n18-example -/nix/store/ibcyipq5gf91838ldx40mjsp0b8w9n18-example -</screen> - - <para>Then delete the path from the store, and try substituting it from the binary cache:</para> - <screen> -$ rm ./result -$ nix-store --delete /nix/store/ibcyipq5gf91838ldx40mjsp0b8w9n18-example -</screen> - -<para>Now, copy the path back from the cache:</para> -<screen> -$ nix-store --realise /nix/store/ibcyipq5gf91838ldx40mjsp0b8w9n18-example -copying path '/nix/store/m8bmqwrch6l3h8s0k3d673xpmipcdpsa-example from 's3://example-nix-cache'... -warning: you did not specify '--add-root'; the result might be removed by the garbage collector -/nix/store/m8bmqwrch6l3h8s0k3d673xpmipcdpsa-example -</screen> -</section> -<section> - <title>Conclusion</title> - <para> - We now have a Nix installation configured to automatically sign and - upload every local build to a remote binary cache. - </para> - - <para> - Before deploying this to production, be sure to consider the - implementation caveats in <xref linkend="chap-post-build-hook-caveats" />. - </para> -</section> -</chapter> |